Resolve "Not storing groups for documentations is kind of a problem"

Closes #351 (closed)

aleksis/apps/alsijil/frontend/components/extra_marks/ExtraMarkButtons.vue

 <script>
-import { extraMarks } from "./extra_marks.graphql";
+import { extraMarksList } from "./extra_marks.graphql";
 
 export default {
   name: "ExtraMarkButtons",
@@ -10,7 +10,7 @@ export default {
   },
   apollo: {
     extraMarks: {
-      query: extraMarks,
+      query: extraMarksList,
       update: (data) => data.items,
       skip() {
         return this.customExtraMarks.length > 0;